Ostriches, the largest birds on the planet ... consider more manageable avian companions like chickens or ducks. For your ...

But Dr Braun said it was the humble chicken that was the "model species" for studying some extreme examples of avian evolution - including how giant, flightless birds like the ostrich evolved.

Some, like penguins, have lost the ability to fly but retained their wings. Birds are found worldwide and in all habitats. The largest is the nine-foot-tall ostrich. The smallest is the two-inch ...